sirius radio rocks
did you guys check out the free player
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First, neither XM nor Sirius is "regulated by the FCC" (at least not for program content - just for the allocations of frequencies for both services). I can't imagine what would give you an idea like that.
Second, the two services broadcast on slightly different frequencies, and equipment designed for one will not work with the other (so choose carefully BEFORE buying the equipment). It is possible to use some of the new micro antennas with either service but it is not recommended.
Third, be cautious about the Sirius lifetime offer. It is for the lifetime of the receiver, not your lifetime. If the receiver breaks down or you decide to upgrade next year to a newer one then you will have spent $500 for one year of service. However, Sirius often offers a "15 months for the price of 12" special that brings their price close to the same $10 per month as XM.
I have both services in different vehicles and, although I prefer Sirius, they really aren't that different. Sirius has more mainstream programming while XM is a little more "edgy". Reception is generally better with Sirius and their tuners seem to have several seconds of memory built-in (I can go halfway through a tunnel before losing Sirius signal whereas I lose the XM signal almost as soon as I enter the tunnel). That means that overpasses and heavily treed streets have less effect on Sirius than on XM.
There seems to be a mistaken impression that these antennas need to be mounted on a metal surface for good reception. The metal surface is only necessary for the magnetic mount to work - use two-sided tape instead. A metal "ground plane" is only necessary for transmitting antennas (CB, short wave, etc.) and has no effect on reception.





